Use DPM where possible

Marlin/fastio.h

 
 /// set pin as input wrapper
 #define SET_INPUT(IO)  _SET_INPUT(IO)
+/// set pin as input with pullup wrapper
+#define SET_INPUT_PULLUP(IO) do{ _SET_INPUT(IO); _WRITE(IO, HIGH); }while(0)
 /// set pin as output wrapper
 #define SET_OUTPUT(IO)  _SET_OUTPUT(IO)
 

Marlin/temperature.cpp

         setPwmFrequency(E0_AUTO_FAN_PIN, 1); // No prescaling. Pwm frequency = F_CPU/256/8
       #endif
     #else
-      pinMode(E0_AUTO_FAN_PIN, OUTPUT);
+      SET_OUTPUT(E0_AUTO_FAN_PIN);
     #endif
   #endif
   #if HAS_AUTO_FAN_1 && !AUTO_1_IS_0
         setPwmFrequency(E1_AUTO_FAN_PIN, 1); // No prescaling. Pwm frequency = F_CPU/256/8
       #endif
     #else
-      pinMode(E1_AUTO_FAN_PIN, OUTPUT);
+      SET_OUTPUT(E1_AUTO_FAN_PIN);
     #endif
   #endif
   #if HAS_AUTO_FAN_2 && !AUTO_2_IS_0 && !AUTO_2_IS_1
         setPwmFrequency(E2_AUTO_FAN_PIN, 1); // No prescaling. Pwm frequency = F_CPU/256/8
       #endif
     #else
-      pinMode(E2_AUTO_FAN_PIN, OUTPUT);
+      SET_OUTPUT(E2_AUTO_FAN_PIN);
     #endif
   #endif
   #if HAS_AUTO_FAN_3 && !AUTO_3_IS_0 && !AUTO_3_IS_1 && !AUTO_3_IS_2
         setPwmFrequency(E3_AUTO_FAN_PIN, 1); // No prescaling. Pwm frequency = F_CPU/256/8
       #endif
     #else
-      pinMode(E3_AUTO_FAN_PIN, OUTPUT);
+      SET_OUTPUT(E3_AUTO_FAN_PIN);
     #endif
   #endif
 

Marlin/ultralcd.cpp

     #endif
 
     #if ENABLED(REPRAPWORLD_KEYPAD)
-      pinMode(SHIFT_CLK, OUTPUT);
-      pinMode(SHIFT_LD, OUTPUT);
-      pinMode(SHIFT_OUT, INPUT);
-      WRITE(SHIFT_OUT, HIGH);
-      WRITE(SHIFT_LD, HIGH);
+      SET_OUTPUT(SHIFT_CLK);
+      OUT_WRITE(SHIFT_LD, HIGH);
+      SET_INPUT_PULLUP(SHIFT_OUT);
     #endif
 
     #if BUTTON_EXISTS(UP)
   #else // !NEWPANEL
 
     #if ENABLED(SR_LCD_2W_NL) // Non latching 2 wire shift register
-      pinMode(SR_DATA_PIN, OUTPUT);
-      pinMode(SR_CLK_PIN, OUTPUT);
+      SET_OUTPUT(SR_DATA_PIN);
+      SET_OUTPUT(SR_CLK_PIN);
     #elif defined(SHIFT_CLK)
-      pinMode(SHIFT_CLK, OUTPUT);
-      pinMode(SHIFT_LD, OUTPUT);
-      pinMode(SHIFT_EN, OUTPUT);
-      pinMode(SHIFT_OUT, INPUT);
-      WRITE(SHIFT_OUT, HIGH);
-      WRITE(SHIFT_LD, HIGH);
-      WRITE(SHIFT_EN, LOW);
+      SET_OUTPUT(SHIFT_CLK);
+      OUT_WRITE(SHIFT_LD, HIGH);
+      OUT_WRITE(SHIFT_EN, LOW);
+      SET_INPUT_PULLUP(SHIFT_OUT);
     #endif // SR_LCD_2W_NL
 
   #endif // !NEWPANEL